How to add warehouses in CentOS:
If you need to install some additional packages within the dedicated server and these packages do not exist within existing repositories that you may have already enabled and need to add a repository to the server to obtain the program you wish to do so by following the previous steps.
Steps to add repositories within Repos :
Step 1: Log on to your custom server as a root user.
Step 2: Run the following command in your shell instance.
rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
Retrieving http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
warning: /var/tmp/rpm-tmp.BNvGWL: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEY
Preparing... ########################################### [100%]
1:epel-release ########################################### [100%]
Step 3: Finally your yum command is updated, in which case you will be prompted to confirm the changes by pressing y and then entering or you can only add the command
That's it
yum update